Patent number 8509037 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "The present disclosure relates to optical components used in applications such as heat assisted magnetic recording (HAMR). A HAMR device utilizes a magnetic recording media (e.g., hard drive disk) that is able to overcome superparamagnetic effects that limit the areal data density of typical magnetic media. In order to record on this media, a small portion of the media is locally heated while being written to by a magnetic write head. A coherent light source such as a laser may provide the energy to create these hot spots, and optical components, e.g., built in to a slider that houses the write head, are configured direct this energy onto the media."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "One embodiment described herein is directed to an apparatus having a waveguide extending away from a media-facing surface. The waveguide includes top and bottom cladding layers and a core disposed therebetween. The core includes a middle core layer and an outside core layer having respective first and second indices of refraction. The first index of refraction is smaller than the second index of refraction. A near field transducer is disposed within the middle core layer proximate the media-facing surface.
"In another embodiment, an apparatus includes a waveguide extending away from a media-facing surface. The waveguide has top and bottom cladding layers and a core disposed therebetween. The top and bottom cladding layers have respective top and bottom indices of refraction. The top index of refraction is higher than the bottom index of refraction, and the core has a higher index of refraction than both the top and bottom indices of refraction. The apparatus includes a near-field transducer disposed in the top cladding layer proximate the media-facing surface.
"These and other features and aspects of various embodiments may be understood in view of the following detailed discussion and accompanying drawings."
URL and more information on this patent, see: Huang, Xiaoyue; Peng, Chubing. Layered Optical Waveguide and near Field Transducer. U.S. Patent Number 8509037, filed
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